Vat dye.



' olive to gray-to brownish-black fast shades.

. dye is a dark powder soluble in turning suliirrnn smiths wrest oenioe.

PAUL 'rnomescnnwsm,

OF VOHWINKEL, NEAR ELBERFELD, GERMANY, ASSIGNOR TO FARBENFABRIKEN VORM. FRIEDR. BAYER 8c 00.; OF ELBERFELD, GERMANY, A

VAT DYE.

eeiieee.

No Drawing.

To all whom it may concern: I

Be it known that l. PAUL Trioiunsci nw- SKI, doctor of phi-losrphy, chemist, citizen ofthe German Em ire, residing at Vohwinkel, near Elberfeld, ermany, have invented new and useful Improvements in Vet, Dyes. of which the following is a specification.

My invention relates to the manufacture and production of new vat dyes of the F111- thracene series. The process for their production consists in treating anthrnquinone xnercaptans or the disulfids (obtainedfroin nierceptans by oxidation) with sulfur.

The new dyes are after being dried and pulverized from brown to black powders which are insoluble in water, :illnilies, alkaline sulfide and organic solvents. 'lhe'y yield on treatment with hydrosulfite and caustic alkali vats suitable for dyeing cotton irooi in order to illustrate the new process more fully the following example is given. the parts being by weight- :--l part of enthraquinone -dimereaptan introduced into 8 parts of molten sulfur. The mixture is then slowly heated to 300 5. until the disengagement of 3H ceases. After cooling the product of the reaction is powdered, extracted with 21 sodium sultid solution to remove tree sulfur, filtered oil and washed. The new turic acid per cent. $0 with eduli red color. The vet with hydrosultite and NaOl-l has 3. violet-brown color. olive shades.

it dyes cotton fest specification of Letters Patent. Patgntedl June 1 &, 1919. Application filed February 19,1910. Serial No. 544,868.

The dyes obtained from anthraquinone-I- or Q-mercaptan and sulfur dye olive-gray. T he dyes obtained from Z-methylanthraquinone1-1nercaptan, -lor :i-amiuoanthraqninone 1 -1nercaptan dye grayish brown to black-brown.

I claim:

1. The herein described new dyes obtainable from nut-hrnquinone lnercaptans, which dyes are after being dried and pulverized from brown to black powders, which are insoluble in water, elkali'es, alkaline sulfids and vats with hydrosulorganic solvents, giving v which vets dye cotlite and caustic soda lye. ton from olive to gray to test shades, substantially as described.

2. The herein described new dye obtainable from anthrequiuone 1.5 dimercaptan and sailfunwhich is lifter being dried and pulverized :1 dark powder soluble in fuming sulfuric acid containing 20 per cent. S0 with a dull red color. forming a violet-brown et with hydrosullite and NQOH which vat dyes cotton fast olive shades, substantially as described. i

In testimony whereof I have hereunto set my hand in the presence of two witnesses.

nun. 'iiioiiisoiuiwsin. h. 3.1

\Vitnesses ()Tn) item, Gulls. J. lVnion'r.

brownish-black.

subscribing 

